import React, { Component } from 'react'
import { nanoid } from 'nanoid'
import './index.css'

export default class Header extends Component {
  // 键盘回调事件
  handleKeyup = event => {
    const { keyCode, target } = event
    if (keyCode != 13) return
    if (target.value.trim() == '') {
      alert('输入不能为空')
      return
    }
    const todoObj = { id: nanoid(), name: target.value, done: false }
    this.props.addTodo(todoObj)

    // 清空输入框
    target.value = ''
  }
  render() {
    return (
      <div className="todo-header">
        <input type="text" placeholder="请输入你的任务名称，按回车键确认" onKeyUp={this.handleKeyup} />
      </div>
    )
  }
}
